Fillo

Fillo is a form builder tool that lets coding agents create and integrate functional product forms directly into apps.

Fillo lets your coding agent build functional product forms directly into your app. It handles validation, file uploads, responses, versions, and delivery infrastructure without the need for an iframe or separate backend project. The form controls render natively using React, Vue, Svelte, Astro, or plain browser apps, keeping your design system in charge. Every answer automatically carries account and user context, while large files go straight to your connected storage like Amazon S3, Google Drive, Box, or Cloudflare R2. It is designed for developers building onboarding, support, feedback, and intake forms directly into their products. You can review submissions, export data, and send responses to webhooks and external tools.

Fillo at a glance

Best for: Software engineer, Product manager
Runs on: Web
Pricing: Free plan includes 200 responses/month; Everything plan starts at €35 ($39)/month for 5,000 responses
Released: September 2026
Category: AI coding tool
Website: fillo.so

Key features

Build forms using your coding agent
Handle validation, uploads, and delivery
Render native HTML controls in your app
Attach invisible context to responses
Upload large files direct to S3, Drive, Box, or R2
Review and export response data
Maintain versioned forms without breaking old answers

Use it for

Collecting product onboarding information
Gathering user feedback and support requests
Handling file requests and approvals
Managing customer intake flows

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